Triance, J. (1981). Cobol programming. NCC Pub.
Cita Chicago (17th ed.)Triance, J.M. Cobol Programming. Oxford Road, Manchester: NCC Pub, 1981.
Cita MLA (9th ed.)Triance, J.M. Cobol Programming. NCC Pub, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.